Help me find the answer

On a piece of paper graph f(x)=5•(0.4)^x

The chs baseball team was on the field and the batter popped the ball up. the equation b(t)=80t-16•16+3.5 represents the height of the ball above the ground in feet as a function of time in seconds. how long will the catcher have to get in position to catch the ball before it hits the ground? round to the nearest second

Find an equation of the line perpendicular to the graph of 28x-7y=9 that passes through the point at (4,1)